Means for attaching insulating-linings.



C. D.`PLA'TT. MEANS FOR ATTAGHING INSULATING LININGS .APPLICATION FILED SEPT. 26, 1908. 937,463

occ. 19,1909.

Patented Witness@ nnrinn srirrns ari-cnr orksten.

CLARENCE D. PLAT'l. 0F BRIDGEPORT. CONNECTICUT.

MENS FOR ATTACIA-IING INSULATING-LININGS.

specification of Letters raient'.

Patented Get. 19, 1909.

Applicatonled September 26, 1908. Serial No. 454,903.

T o all uliom -i-t may concern.:

insulating linings in the shells.

I t is of courseessential that the shell and lining shall be strong enough to stand -all handling or treatment'without becoming separated,'in use. But as it. is frequently desii-able to remove the linings from a stock of shells so that the shells can be retinished to change the style thereof, the means ,which holds'the shells and linings together should be such as to permit them to be readily se`pa rated, lbecause in the refinishing of `the metal shells it is usually necessary to put them in an acid bath, and this would destroy or injure the linings. Sometimes the shells need to be changed as to their. finishino so as to be what is known as brush, brass or.

antique brass or other styles of inish.

In carrying out my invention I provide the shell "with a removable lining having such relative diameters as to leave a slight space between themsutiicient to allow for the swelling of ,the lining which usually occurs in damp'weather, and to provide the shell and lining with vinterlocking shoulders to hold the members assembled.

In the accompanying drawing forming a part of this specification, Figure l represents' a longitudinal section of an electric socket shell with an insulating lining therein in its oxidized copper or final position; Fig. 2 1s a similarviewv but showing the parts in the act. of being assembled.

p 10 denotes the shell of an incandescent lamp socket which is shown as provided with the usual shoulder-11, it beine' customary to make the ends of socket shells of different diameters, and 13 denotes a circumferential rib near the smaller end of the shell, this rib lieing of the usual form employed to coa'ct with the attaching devices of shades- 14: denotes the lining which may be made of any suitable insulating ymaterial andis shown as provided with a shoulder 15 eorrel from, the

interlock with the rib lof the shell.

sponding with the shoulder l1 of the socket shell. Both the shell and the lining are shown as provided with slots 1T which are placed in alinement. in assembling and receive the shaft of the switch-key (not shown). The lining is provided withV a circumferential rib,16 which isA adapted to These two ribs interlock when the -members are relatively moved in' the directions of the arrows a. and b in Fig. 2, to the position shown in Fig. l, in which latter position the under-surface' ofthe bead 12 coacts with the upper surface of the rib 16, said surfaces forming shoulders which interlock so as to retain the lining` securely in the shell no matter in what position the shell may be placed. The inter-nal surface of the shoulder l1 and the external surface of the shoulder la simply serve to limit the relative movements of the two members when being asse-mbled.A They are in no sense interlocking shoulders, although they do, to some extent, coact with the contacting surfaces of the bead 12 and rib lo to prevent any longitudinal movement of one member relatively to the other when the two are assembled, although there is` a clear space between all other portions of the two members.

It is to be understood that the drawings show the device considerably' enlarged, and that the relative diameters of the bead 12 and rib 1G, or rather the shoulders presented thereby, are somewhat exaggerated in order that the drawings may illustrate the interlocking action. In practice ythe relative diameters are such that by thc employment of not too great a force', the parts can be shifted from the position shown in Fig. 2 to that shown in Fig. l. And still they may vbe separated by relative movements in the directions opposite to that represented by the arrows a and b, whenever it is desirable to get the linings out for the purpose of retinishing, or altering the finish of, the metal shells. l

' The engagement or interlocking of the shoulders provided by the contactingsnrfaces of the bead 12 and the rib 1G is strong enough to hold the parts assembled under all conditions of handling or treatment, and yet the space which exists betwcien the lining and the "shell not. only permits the lining to swell in damp weather, but also renders it easily practicable to separate the linings shells in the manner and for-the loo purposedeseribed, there being no such frio tional engagement as would prevent such separation.

the location is preferablyj for purposes of convenience ot' manufacture, usual .rib 13 as shown.

A socket shell and lining.r ative diameters being sneu close to the 'to leave no v described my invention, 'l

or, the

i i l slight space between them, the shell having an inwardly projecting annular bead,the 1ining having an outwardly projecting circumferential rib to interlock with said bead, and the shell and lining having other eoacting shoulders to limit the relative positions when the shell and lining are assembled,

In testimony whereof l atix my signature, in presence of two witnesses.

CLARENCE D. PLATT. lVitnesses A. M. lVoosTnm S. lV. A'rHnR'roN. 

